Some people recommend 27mm torsion bars and ~400 in/lb springs, others recommend 30mm torsion bars and ~500in/lb springs. I woudl think the softer setup would be better for me as I race on smooth asphault more often. If this is the case, what is a good spring rate to start with (ie, 400, 425, 375, ect).

It seems like I am looking for a 3/4" sway bar for the rear. Is this correct?

What alignment specs are a good starting point for this car?


BTW, I do have lots of solo experience. I've been racing for 5 years now in the Chicago/Milwaukee and have done 20-25 solo events and a handful of ice races each year since 2001 and work chair positions at other local, non SCCA groups (but are just as large as the SCCA solo programs in their respective area with 130-175 people at each event)





Modified by Pylon_Boy at 3:50 PM 11/21/2004

 

I hadn't heard of 30mm T bars. I think 29mm is the largest you can get without a custom set and OPM should have them. The thing that holds you back is you transmit too much stress to the splines when the T bar diameter is greater than the root diameter of the splines.

But go as large as you can get on the T bars and I'd run at least 450-500s in the rear. I do have some rear sway bars for that car however they aren't bolt on. Email me for some pictures.

 

If you're on smooth pavement most of the time stiffer might be better, a lot of the compromise in stiffness of a suspension setup comes from the necessity of making the car stay in contact with the road over bumps/curbs/miatas. I'd go for the 29's, seems like from what I've read even the guys with 29's would like to go stiffer in the front but there's nothing out there anymore.

 

I would go with 27mm and 450 lb rears (which is what I have).

I could be wrong, but I believe 29mm is as large as possible, and still fit. When I put in my 27s, they were close to the maximum.

 

I too have only heard of 29s before but I know of a number of serious autocross cars using them. When I built my '86 for ITA back in about '92, 24mm T-bars were what everyone was using beack then.

BTW, if anyone has a set of used aftermarket, slightly larger than stock torsion bars (under 24mm) that they'd like to sell cheap, I might be interested for a street car.

 

Lee,

Let me dig around.

 

I run 29MM bars with 600# springs in the rear.

I need more. Thats like an effective 375 lb rate in the front, weak...

 

hmm. i think i'm going to be running either 27's or 29's on the front of my civic for autox. don't know yet.

 

I don't know if the SP rules allow it, but why not add a coilover to the strut to supplement the torsion bar?

 

there is no room for an additional spring up front, I can barely get my finger between the tire and the shock shaft.

 

29mm is the largest physical bar you can fit in the tube. Even that is tight. I think I bought mine from Dave (SMSP)...

With the 29's, I have 400lb springs currently, with a 3/4 rear bar. I have a fair bit of understeer, so next year I'll be running 600lb springs with revalved KONI's front and rear.

 

29mm front bars 600# rear springs, DX frt bar, Welded up rear torsion bar in the axle. Koni shocks revalved and shortned and some delrin LCA bushings. Should be perfect for a CRX.

Blake
41 GP

 

My prepared car has 29's, 500 lb springs, an adjustable 3/4" rear bar set full stiff, as well as having the rear axle beam strapped to minimize droop, to maximize weight transfer to the outside rear. Oh, and no front bar.

As for alignment, more camber with radials, less with bias plies.